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离体气干使小麦叶片很快遭受水分胁迫,叶片不产生渗透调节作用,水势和膨压降低较快,从而使叶片净光合率(Pn)、气孔导度(Gs)和叶肉CO_2导度(G’m)迅速降低;土壤干旱下,叶片水势降低较缓慢,并产生不同程度的渗透调节作用,使膨压得到部分维持,Pn、Gs和Gm’降低幅度减小.两种方式干旱胁迫下,陕合六号叶片持水力和渗透调节大于郑引一号,Pn、Gs和G’m都明显高于郑引一号.因此,陕合六号小麦有较强的耐旱性.
Except for air-drying, the wheat leaves were quickly subjected to water stress, and the leaves did not have the osmotic adjustment effect. The water potential and turgor decreased rapidly, and the net photosynthetic rate (Pn), stomatal conductance (Gs) G’m) decreased rapidly under soil drought conditions, and the leaf water potential decreased more slowly and produced different degrees of osmotic adjustment, so that the turgor was partially maintained and the decrease of Pn, Gs and Gm ’was reduced. , The hydraulic and osmoregulation of Shagan-6 leaves were greater than that of Zheng-Yin-1, and Pn, Gs and G’m were significantly higher than that of Zheng-Yin 1. Therefore, Shanyi-6 wheat had stronger drought tolerance.